Automatic flow regulating device and method for stem pressing machines

Abstract

The invention discloses an automatic flow regulating device and method for stem pressing machines. The method includes: setting an upper limit value H and a lower limit value L for operating frequency of a frequency converter; setting required amount d for current stem pressing thickness; judging material piling to be within a normal range and output frequency of the frequency converter to be P value when material height is smaller than a high-level photoelectric switch, and performing automatic regulation according to change of pressed stems in thickness according to the formula of P=L+K1*d; when the material height is larger than the high-level photoelectric switch but smaller than a material-plugging-level photoelectric switch, judging material piling to be over high, lowering the output frequency of the frequency converter to be the low limit value L to reduce flow of the materials; when the material height is larger than the material-plugging-level photoelectric switch, judging material piling to be in material plugging state, setting the output frequency of the frequency converter to be zero, shutting down a feeding conveyor, and enabling a monitoring unit to send an alarm. By the arrangement, the operating frequency of the frequency converter can be automatically regulated, in other words, material flow of the feeding conveyor can be regulated, evenness of the pressed stems in thickness is guaranteed, and plugging is prevented.

Description

technical field [0001] The invention relates to a device and method for automatically regulating the flow of a stem press machine, belonging to the field of tobacco shred making equipment and control. Background technique [0002] The stem pressing machine of the tobacco shred production line mostly adopts the form of symmetrical roller extrusion, and the rehydrated tobacco stem is sent between two oppositely running rollers, and is squeezed when passing through the gap, so as to achieve a certain stem pressing effect. In actual production, the gap between the rolls is adjusted according to the technological index requirements for the thickness of the stem. When the thickness of the stem is thinner, the gap between the rolls is adjusted smaller, so that the passing capacity of the tobacco stems in the gap is reduced, and the flow rate of the incoming material cannot be adjusted accordingly. Tobacco stems are easy to accumulate above the gap between the rolls, the extrusion e...

AI Technical Summary

Problems solved by technology

In actual production, the gap between the rolls is adjusted according to the technological index requirements for the thickness of the stem. When the thickness of the stem is thinner, the gap between the rolls is adjusted smaller, so that the passing capacity of the tobacco stems in the gap is reduced, and the flow rate of the incoming material cannot be adjusted accordingly. Tobacco stems are easy to accumulate above the gap between the rollers, the extrusion effect is reduced, and the phenomenon of uneven thickness of the pressed stems and even material blockage is easy to occur.

At present, many stalking equipment use a set of through-beam photoelectric switches to detect the height of the material, which can only give an alarm for the phenomenon of material blocking, lack of automatic adjustment function for the flow of incoming materials, and cannot make the flow rate according to the thickness of the stalk and the accumulation of materials. Make timely adjustments, unable to meet the existing lean production requirements

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